JLink no longer able to flash nRF52833

[tracychen]

Hello,

I am working with a nRF52833 and I am no longer able to use my JLink Base to flash it. I was previously able to flash it and there was no hardware change at all and the firmware changes should not have messed around with any pins used for flashing (e.g. SWD). I checked to make sure that the board is being powered normally and it is. Below are the following connections between the board and JLink. I have tried flashing with and without the MCU reset pin connected and neither work. The log.log file is attached. Any insight on how to unbrick the board would be appreciated - thank you! 

- VBUS <> VTref

- GND <> GND

- SWDCLK <> SWDCLK

- SWDIO <> SWDIO

- MCU reset <> MCU reset

2161.log.log

[Jared]

Hi,

What voltage do you measure on the reset pin?

regards

Jared 

[tracychen]

I'm measuring 0V

[Jared]

Hi,

The Reset pin is active low, which means that if the reset pin feature has been activated in FW (which it is by default in our SDK examples) the nRF will be held in reset state. Try pulling the pin high and see if there is any other external signal connected to the pin that might pull it low.

regards

Jared